Hi,
2010/8/13 Reinhard Meyer u-boot@emk-elektronik.de:
Dear Remy Bohmer,
- I did not follow the whole USB patches, my concern is
what touches AT91, but please explain to me what for we need a board under u-boot to be a USB device. Since u-boot per se is not multitasking how is the traffic handled while at the command prompt?
There is no traffic handled while at the command prompt. It behaves just like any other 'normal' network adapter. So, it brings up a USB connection once you start a network action like a ping or tftp command. Once that completes the link is brought down again.
If I understand the procedure correctly now, its as follows:
Any client network command on u-boot's command prompt like ping, dhcp, tftp etc. will 'up' the USB Device... The host to which it is connected to will happily discover and enumerate a network adapter with MAC and IP addresses...
Correct.
And the host will be the server for that command...
The procedure is initiated by U-boot, since that one is pulling the D+ resistor up and down. Network traffic is of course bidirectional, so U-boot can initiate a TFTP transfer when it is up.
Kind regards,
Remy